In recent years, with the increasing depth of coal mining, the geological conditions faced by the grouting renovation are developing in a more complex direction, and the traditional method of evaluating the effect of grouting has been difficult to meet the needs of refined and quantitative engineering.Taking the grouting renovation project of S33 and S39 drilling holes in the four-five grey aquifer of the 11-coal roof of Qiuji coal mine in Shandong Province as the background, four influencing factors, such as final pressure of grouting, unit grouting volume, unit water absorption rate, and drilling fluid leakage, are selected as the evaluation indexes, and the weights of grouting evaluation indexes are determined by the entropy weighting method to improve the CRITIC method and combined with the AHP, and the grey correlation coefficients are introduced to improve the traditional TOPSIS method on the basis of which the traditional TOPSIS method is improved. On this basis, the grey correlation coefficient is introduced to improve the traditional TOPSIS method, and the GRA-TOPSIS-RSR grouting effect evaluation model is established. The evaluation results are compared and analysed with the water influx revealed by downhole drilling after grouting, and the evaluation results are basically consistent with the on-site verification, indicating that the GRA-TOPSIS-RSR evaluation model has good applicability. The method effectively improves the refinement of grouting effect evaluation and enriches the theoretical system of grouting effect evaluation to a certain extent.